File Coverage

blib/lib/MogileFS/Checksum.pm
Criterion Covered Total %
statement 9 43 20.9
branch 0 12 0.0
condition 0 6 0.0
subroutine 3 12 25.0
pod 0 9 0.0
total 12 82 14.6


line stmt bran cond sub pod time code
1             package MogileFS::Checksum;
2 21     21   118 use strict;
  21         41  
  21         703  
3 21     21   112 use warnings;
  21         42  
  21         810  
4 21     21   118 use overload '""' => \&as_string;
  21         38  
  21         264  
5              
6             my %TYPE = (
7             "MD5" => { type => 1, bytelen => 128 / 8 },
8             "SHA-1" => { type => 2, bytelen => 160 / 8 },
9              
10             # see POD for rationale below
11             # "SHA-224" => { type => 3, bytelen => 224 / 8 },
12             # "SHA-256" => { type => 4, bytelen => 256 / 8 },
13             # "SHA-384" => { type => 5, bytelen => 384 / 8 },
14             # "SHA-512" => { type => 6, bytelen => 512 / 8 },
15             );
16              
17             our %NAME2TYPE = map { $_ => $TYPE{$_}->{type} } keys(%TYPE);
18             our %TYPE2NAME = map { $NAME2TYPE{$_} => $_ } keys(%NAME2TYPE);
19              
20             sub valid_alg {
21 0     0 0   my ($class, $alg) = @_;
22              
23 0 0         defined($alg) && defined($TYPE{$alg});
24             }
25              
26             sub new {
27 0     0 0   my ($class, $row) = @_;
28 0           my $self = bless {
29             fidid => $row->{fid},
30             checksum => $row->{checksum},
31             hashtype => $row->{hashtype}
32             }, $class;
33              
34 0           return $self;
35             }
36              
37             # $string = "MD5:d41d8cd98f00b204e9800998ecf8427e"
38             sub from_string {
39 0     0 0   my ($class, $fidid, $string) = @_;
40 0 0         $string =~ /\A([\w-]+):([a-fA-F0-9]{32,128})\z/ or
41             die "invalid checksum string";
42 0           my $hashname = $1;
43 0           my $hexdigest = $2;
44 0 0         my $ref = $TYPE{$hashname} or
45             die "invalid checksum name ($hashname) from $string";
46 0           my $checksum = pack("H*", $hexdigest);
47 0           my $len = length($checksum);
48 0 0         $len == $ref->{bytelen} or
49             die "invalid checksum length=$len (expected $ref->{bytelen})";
50              
51 0           bless {
52             fidid => $fidid,
53             checksum => $checksum,
54             hashtype => $NAME2TYPE{$hashname},
55             }, $class;
56             }
57              
58             sub hashname {
59 0     0 0   my $self = shift;
60 0           my $type = $self->{hashtype};
61 0 0         my $name = $TYPE2NAME{$type} or die "hashtype=$type unknown";
62              
63 0           return $name;
64             }
65              
66             sub save {
67 0     0 0   my $self = shift;
68 0           my $sto = Mgd::get_store();
69              
70 0           $sto->set_checksum($self->{fidid}, $self->{hashtype}, $self->{checksum});
71             }
72              
73             sub maybe_save {
74 0     0 0   my ($self, $dmid, $classid) = @_;
75 0           my $class = eval { Mgd::class_factory()->get_by_id($dmid, $classid) };
  0            
76              
77             # $class may be undef as it could've been deleted between
78             # create_open and create_close, we've never verified this before...
79             # class->{hashtype} is also undef, as we allow create_close callers
80             # to specify a hash regardless of class.
81 0 0 0       if ($class && defined($class->{hashtype}) && $self->{hashtype} eq $class->{hashtype}) {
      0        
82 0           $self->save;
83             }
84             }
85              
86             sub hexdigest {
87 0     0 0   my $self = shift;
88              
89 0           unpack("H*", $self->{checksum});
90             }
91              
92             sub as_string {
93 0     0 0   my $self = shift;
94 0           my $name = $self->hashname;
95 0           my $hexdigest = $self->hexdigest;
96              
97 0           "Checksum[f=$self->{fidid};$name=$hexdigest]"
98             }
99              
100             sub info {
101 0     0 0   my $self = shift;
102              
103 0           $self->hashname . ':' . $self->hexdigest;
104             }
105              
106             1;
107              
108             __END__